k - k = 0
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-k = -1*k, so the coefficient is minus 1
(9+k)-17=x
k
11 - 5k. If k is a number then substitute it in. Example if k were to equal 2, then 11 - 5*2 = 11-10 = 1. It depends on the value of k.
2 k^2 - k - 4 = 0 2 (k^2 - (1/2)k - 2) = 0 2 ((k - 1/4)^2 - 1/16 - 2) = 0 2 ((k - 1/4)^2 - 33/16) = 0 2 (k - 1/4 - sqrt(33)/4)(k - 1/4 + sqrt(33)/4) = 0 32 (4k - 1 - sqrt(33))(4k - 1 + sqrt(33)) = 0